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	<title>Document</title>
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	<script type="text/javascript">
		//计算1*2*3*4*5*6*7*8*9*10*11*12*13
		var result = 1;		//累乘器

		for(var i = 1 ; i <= 13 ; i++){
			result = result * i;
		}
		console.log(result);
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